Arrangement for producing slightly-damped electrical oscillations.



B. MAGKU, L. MANDELSTAM (z N. PAPALBXI. ARRANGEMENT FOR PRODUCING SLIGHTLY DAMPED ELECTRICAL osmmmrzs.

' APPLICATION FILED APR.26. 1911.

1 Q87 126 Patented Feb. 17, 1914 TED STATES PATE T OFFICE.

BEDRICH IVIACKU, OF BR'llNN, AUSTRIA-HUNGARY, AND LEONID MANDELSTAM AND NICOLAUS EPAALEXL (3F ETRASSBURG, GERMANY.

ARRANGEMENT FOR PRODUCING SLIHTLY-DAMPED ELECTRICAL OSCILLATI E ON S.

To all LliLO'HL it may con cern Be it known that we, Dr. Brannon Macno, a subject of the Austro-Hungarian Emperor, and residing at Bri'inn, Anstria-l-lungary, and Dr. LEONID MANnnLs'r-mi and Dr. Nico- LAUS Pnrnnnxr, subjects of the Russian Eunperor, and both residing at Strassburg, Germany, have invented a certain new and useful Improved Arrangement for Producing Slightly-Damped Electrical Oscillations, of which the following is a specification.

This invention relates to an arrangement for producing slightly damped electric oscillations by condenser discharges and the invention enables an oscillation circuit to be so excited by means of a spark gap that when the discharge takes place, the spark is immediately quenched and the circuit oscillates further without a spark gap and is accordingly but slightly damped.

A simple method of carrying out the in vention is shown diagrammatically in. the figures of the accompanying; drawings, in three modifications. i

Figure 1 represents an arrangement in which the oscillation circuit which contains the slightly damped oscillations formed by two closed oscillation circuits connected by a common spark gap. Fig. represents an arrangement in which one of the oscillation circuits is open, and Fig. 8 represents an arrangement similar to that shown in Fig. 2 in which the antenna not charged with the circuit.

As ma be seen'in Fig. 1 two condenser circuits ormed of a condenser 0, the primary coils t of a transformer and a selfinduction coil 1) are combined with a spark. gap at common to all. The condensers c are charged through charging wires f.

Arrangements in which several circuits are also connected with one spark gap are in themselves al eady known, but in such older arrangements the effect of quenching the spark gap; which is a. feature of the present invention does not take place. This action is attained in the present invention by the two circuits connected with the spark gap being of difl erent frequency and the ratio of the capacity to the self-induction in both circuits being made equal or approximately equal. The current intensity in. the spark gap during discharging is the sum of the intensities of both circuits. Their amplitude undergoes fluctuations (surg- Specification of Letters Yatent.

Patented Feb. 17, 1914.

Application filed April 26, 1913. Serial Bo. 623,539.

ings), the frequency of which is dependent on the tuning and the degree of coupling of the two condenser circuits. By a suitable choice of these values it is possible to client a quenching of the spark at the point of the minimum amplitude of current resulting from the first surging. By the remaining charges the condenser circuits are now each reversely charged (or charges from the remnant energy still take place) and by equalizing the same the entire system is now caused to oscillate as a single circuit in which both capacities 0 and self-induction coils t are connected in series. These oscillations are, however, only slightly damped as the damping influence of the spark is now, entirely eliminated.

An'open circuit or, as shown, for instance,-

in the drawings, an antenna (:1 with earth connection {2 may be suitably coupled, for ii'istancc, over the secondary coils t, with this exciting circuit. Instead of an inductive coupling direct connection of the antenna with the oscillation circuit may also he formed. Instead of coupling both separate circ with the antenna it will also fully sullicc to only connect one circuit with them. as when excited the entire energy flows over the transformer coils t. If the antenna be caused to act in conjunction with both oscillotion circuits 1;, t, i), as shown in Fig. 1, the coupling must be so arranged that the original oscillations of the separate circuits counteractcach other in the antenna. In many cases it is even preferable to couple with each other inductively the two separate circuits c, t, b, in such way that the two transfori'ner coils 25 are brought into close magnetic relation to each other, b

()ne of the two circuits connected with the spark gap may, however, also he formed directly as an open circuit or as antenna. l is a diagram of the simplest form of this modification. .a is the spark gap, 7) the self-induction coil and e the capacity of a closed circuit connected with the spark gap.

through a large self-induction coil h (for instance a choking coil) with the other pole of the spark gap. \Vhen charged, the antenna is then itself not charged, but the charge received on one hand by the coudenser c of the closed circuit and on the other hand by the condenser over the sell?- indu tion coil h which offers no appreciable resistance to the charging current. Tl is coil, houcrcr, locks the Way to rapid oscitlati us during the discharge, so that. these os iliatious again, as before, take place first in the open circuit (7, g, (2, and also in the closed. circuit Z c, but after the quenching the spark exclusively in the circuit (f. f/, 5;, c. a. it is a particular advantage of this term of (amstruction that. it. allows greater We claim:

l. in an arrangen'lcnt 't'or producing itly damped electric oscillations, two ..|.-ition circuits, having a portion includa spark gap common to both circuitc', a nd a third oscillation circuit formed by the iiulcpendent portions of said two first circuits, capacities and self-inductances in said sorting a ccinicnser g in tl'leantcnua and then connecting this condenser by a branch -5,- of ener v to be converted in con- 1 set in motion continues to oscillate in said third circuit.

In an arr: llQClllLIlt for producing slightly damped electric oscillations, two oscillation cirruihthe one circuit being closed, ihe other being arranged as antenna, having a portion including a spark gap common to lioth circuits, and a third oscillation circuit formed by the independent INil'illlL- of said two first circuits, a condcnser in said antenna, a coil of high self inductionin shunt. to said condenser and said spark gap. ,mcities and self-inductances in said luo first circuits suitably propm'ticncd to cause the circuit to oscillate at different oscillation periods. the ratio oi capacity to sclt-inductaiu-c in each of said tuo first tll .llit\ heingrqual or approxh malr-ly ruuai to cause quenching of the spark h the fluctuati n in the two first named circuits \rhereln the energy sciv in motion continues to oscillate in said third circuit.

iiuessees to the signature of Dr. Bedrich Marlin:

Aim Mann. liiilii'illlt, jufo'us'r Frames.

itnesses as to the signatures of Dr. Leonid .llandclstaui and Dr. Nicolaus Papa lexi:

Vnunnui lssaiiovrrcii, .llni:ar.\i\'x .houanxx. 

